<script setup lang="ts">
  import {
    reqCartSelectedAll,
    reqDelCartGoods,
    reqGetCartList,
    reqUpdateCartGoods
  } from '@/api/cart'
  import type { CartItem } from '@/types/cart'
  import { onShow } from '@dcloudio/uni-app'
  import { ref } from 'vue'
  import { useUserStore } from '@/stores/user'
  import XtxGuess from '@/components/XtxGuess.vue'
  import { useXtxGuessList } from '@/composables'
  import { computed } from 'vue'
  defineProps<{
    /** 底部是否要插入安全区 */
    safeAreaInsetsBottom?: number
  }>()
  const userStore = useUserStore()
  // 获取购车列表
  const cartList = ref<CartItem[]>()
  const getCartList = async () => {
    // 没有登录不请求数据
    if (userStore.profile?.token) {
      const res = await reqGetCartList()
      cartList.value = res.result
    }
  }
  onShow(() => {
    getCartList()
  })

  // 使用猜你喜欢组合式函数
  const { guessRef, scrollToLower } = useXtxGuessList()

  // 删除商品的回调
  const onDelGoods = (skuId: string) => {
    uni.showModal({
      content: '你确定要删除吗',
      success: async res => {
        if (res.confirm) {
          // 删除对应商品
          await reqDelCartGoods([skuId])
          uni.showToast({
            icon: 'success',
            title: '删除成功'
          })
          getCartList()
        }
      }
    })
  }

  // 商品数量发生改变的回调
  const onCountChange = (count: number, skuId: string) => {
    reqUpdateCartGoods(skuId, { count })
  }

  // 商品勾选/取消勾选
  const onSelectedChange = (item: CartItem) => {
    // 前端页面展示
    item.selected = !item.selected
    // 后端处理
    reqUpdateCartGoods(item.skuId, { selected: item.selected })
  }
  // 计算全选按钮的勾选状态
  const selectedAll = computed(() => {
    return cartList.value?.length && cartList.value?.every(item => item.selected)
  })
  // 全选按钮勾选/取消勾选
  const onSelectedAllChange = () => {
    // 获取点击后当前全选状态
    // 前端页面展示
    const _selectedALl = !selectedAll.value
    cartList.value?.forEach(item => (item.selected = _selectedALl))
    // 后端处理
    reqCartSelectedAll(_selectedALl)
  }

  // 计算勾选的商品列表
  const selectedAllList = computed(() => {
    return cartList.value?.filter(item => item.selected)
  })
  // 计算勾选的总数量
  const selectedAllListCount = computed(() => {
    return selectedAllList.value?.reduce((total, item) => total + item.count, 0)
  })
  // 计算勾选的总金额
  const selectedAllListMoney = computed(() => {
    return selectedAllList.value
      ?.reduce((total, item) => total + item.count * item.price, 0)
      .toFixed(2)
  })
  // 点击去结算
  const gotoPayment = () => {
    if (selectedAllListCount.value === 0) {
      return uni.showToast({
        icon: 'none',
        title: '请选择商品'
      })
    }
    // 去往结算页
    uni.navigateTo({
      url: '/pagesOrder/create/create'
    })
  }
</script>

<template>
  <scroll-view scroll-y class="scroll-view" @scrolltolower="scrollToLower">
    <!-- 已登录: 显示购物车 -->
    <template v-if="userStore.profile?.token">
      <!-- 购物车列表 -->
      <view class="cart-list" v-if="cartList?.length">
        <!-- 优惠提示 -->
        <view class="tips">
          <text class="label">满减</text>
          <text class="desc">满1件, 即可享受9折优惠</text>
        </view>
        <!-- 滑动操作分区 -->
        <uni-swipe-action>
          <!-- 滑动操作项 -->
          <uni-swipe-action-item v-for="item in cartList" :key="item.skuId" class="cart-swipe">
            <!-- 商品信息 -->
            <view class="goods">
              <!-- 选中状态 -->
              <text
                class="checkbox"
                :class="{ checked: item.selected }"
                @click="onSelectedChange(item)"
              ></text>
              <navigator
                :url="`/pagesDetail/detail/detail?id=${item.id}`"
                hover-class="none"
                class="navigator"
                @longpress="onDelGoods(item.skuId)"
              >
                <image mode="aspectFill" class="picture" :src="item.picture"></image>
                <view class="meta">
                  <view class="name ellipsis">{{ item.name }}</view>
                  <view class="attrsText ellipsis">{{ item.attrsText }}</view>
                  <view class="price">{{ item.nowPrice }}</view>
                </view>
              </navigator>
              <!-- 商品数量 -->
              <view class="count">
                <uni-number-box
                  :min="1"
                  :max="item.stock"
                  v-model="item.count"
                  @change="onCountChange($event, item.skuId)"
                />
              </view>
            </view>
            <!-- 右侧删除按钮 -->
            <template #right>
              <view class="cart-swipe-right">
                <button class="button delete-button" @click="onDelGoods(item.skuId)">删除</button>
              </view>
            </template>
          </uni-swipe-action-item>
        </uni-swipe-action>
      </view>
      <!-- 购物车空状态 -->
      <view class="cart-blank" v-else>
        <image src="/static/images/blank_cart.png" class="image" />
        <text class="text">购物车还是空的，快来挑选好货吧</text>
        <navigator open-type="switchTab" url="/pages/index/index" hover-class="none">
          <button class="button">去首页看看</button>
        </navigator>
      </view>
      <!-- 吸底工具栏 -->
      <view
        class="toolbar"
        :style="{ paddingBottom: safeAreaInsetsBottom ? safeAreaInsetsBottom + 'px' : 0 }"
      >
        <text class="all" :class="{ checked: selectedAll }" @click="onSelectedAllChange">全选</text>
        <text class="text">合计:</text>
        <text class="amount">{{ selectedAllListMoney }}</text>
        <view class="button-grounp">
          <view
            class="button payment-button"
            :class="{ disabled: selectedAllListCount === 0 }"
            @click="gotoPayment"
          >
            去结算({{ selectedAllListCount }})
          </view>
        </view>
      </view>
    </template>
    <!-- 未登录: 提示登录 -->
    <view class="login-blank" v-else>
      <text class="text">登录后可查看购物车中的商品</text>
      <navigator url="/pagesMember/login/login" hover-class="none">
        <button class="button">去登录</button>
      </navigator>
    </view>
    <!-- 猜你喜欢 -->
    <XtxGuess ref="guessRef"></XtxGuess>
    <!-- 底部占位空盒子 -->
    <view class="toolbar-height"></view>
  </scroll-view>
</template>

<style lang="scss">
  // 根元素
  :host {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background-color: #f7f7f8;
  }

  // 滚动容器
  .scroll-view {
    flex: 1;
  }

  // 购物车列表
  .cart-list {
    padding: 0 20rpx;

    // 优惠提示
    .tips {
      display: flex;
      align-items: center;
      line-height: 1;
      margin: 30rpx 10rpx;
      font-size: 26rpx;
      color: #666;

      .label {
        color: #fff;
        padding: 7rpx 15rpx 5rpx;
        border-radius: 4rpx;
        font-size: 24rpx;
        background-color: #27ba9b;
        margin-right: 10rpx;
      }
    }

    // 购物车商品
    .goods {
      display: flex;
      padding: 20rpx 20rpx 20rpx 80rpx;
      border-radius: 10rpx;
      background-color: #fff;
      position: relative;

      .navigator {
        display: flex;
      }

      .checkbox {
        position: absolute;
        top: 0;
        left: 0;

        display: flex;
        align-items: center;
        justify-content: center;
        width: 80rpx;
        height: 100%;

        &::before {
          content: '\e6cd';
          font-family: 'erabbit' !important;
          font-size: 40rpx;
          color: #444;
        }

        &.checked::before {
          content: '\e6cc';
          color: #27ba9b;
        }
      }

      .picture {
        width: 170rpx;
        height: 170rpx;
      }

      .meta {
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        margin-left: 20rpx;
      }

      .name {
        height: 72rpx;
        font-size: 26rpx;
        color: #444;
      }

      .attrsText {
        line-height: 1.8;
        padding: 0 15rpx;
        font-size: 24rpx;
        align-self: flex-start;
        border-radius: 4rpx;
        color: #888;
        background-color: #f7f7f8;
      }

      .price {
        line-height: 1;
        font-size: 26rpx;
        color: #444;
        margin-bottom: 2rpx;
        color: #cf4444;

        &::before {
          content: '￥';
          font-size: 80%;
        }
      }

      // 商品数量
      .count {
        position: absolute;
        bottom: 20rpx;
        right: 5rpx;
      }
    }

    .cart-swipe {
      display: block;
      margin: 20rpx 0;
    }

    .cart-swipe-right {
      display: flex;
      height: 100%;

      .button {
        display: flex;
        justify-content: center;
        align-items: center;
        width: 50px;
        padding: 6px;
        line-height: 1.5;
        color: #fff;
        font-size: 26rpx;
        border-radius: 0;
      }

      .delete-button {
        background-color: #cf4444;
      }
    }
  }

  // 空状态
  .cart-blank,
  .login-blank {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    height: 60vh;
    .image {
      width: 400rpx;
      height: 281rpx;
    }
    .text {
      color: #444;
      font-size: 26rpx;
      margin: 20rpx 0;
    }
    .button {
      width: 240rpx !important;
      height: 60rpx;
      line-height: 60rpx;
      margin-top: 20rpx;
      font-size: 26rpx;
      border-radius: 60rpx;
      color: #fff;
      background-color: #27ba9b;
    }
  }

  // 吸底工具栏
  .toolbar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: var(--window-bottom);
    z-index: 1;

    height: 100rpx;
    padding: 0 20rpx;
    display: flex;
    align-items: center;
    border-top: 1rpx solid #ededed;
    border-bottom: 1rpx solid #ededed;
    background-color: #fff;
    box-sizing: content-box;

    .all {
      margin-left: 25rpx;
      font-size: 14px;
      color: #444;
      display: flex;
      align-items: center;
    }

    .all::before {
      font-family: 'erabbit' !important;
      content: '\e6cd';
      font-size: 40rpx;
      margin-right: 8rpx;
    }

    .checked::before {
      content: '\e6cc';
      color: #27ba9b;
    }

    .text {
      margin-right: 8rpx;
      margin-left: 32rpx;
      color: #444;
      font-size: 14px;
    }

    .amount {
      font-size: 20px;
      color: #cf4444;

      .decimal {
        font-size: 12px;
      }

      &::before {
        content: '￥';
        font-size: 12px;
      }
    }

    .button-grounp {
      margin-left: auto;
      display: flex;
      justify-content: space-between;
      text-align: center;
      line-height: 72rpx;
      font-size: 13px;
      color: #fff;

      .button {
        width: 240rpx;
        margin: 0 10rpx;
        border-radius: 72rpx;
      }

      .payment-button {
        background-color: #27ba9b;

        &.disabled {
          opacity: 0.6;
        }
      }
    }
  }
  // 底部占位空盒子
  .toolbar-height {
    height: 100rpx;
  }
</style>
